Study on the Microstructure and Corrosion Resistance of Semi-Solid ZL105 Alloy Containing Ce
The effects of different amounts of rare earth cerium on the microstructure and corrosion resistance of semi-solid ZL105 alloy were investigated by optical microscope,scanning electron microscope,energy spectrum analyzer,microhardness test,salt solution immersion corrosion and electrochemical workstation.The results showed that:with the increasing of the content of rare earth and cerium,the sizes of the primary α-Al phases in ZL105 alloy decreased gradually.When the content of cerium was 0.6％,the grain size of the primary α-Al phase in ZL105 alloy was 65.77 μm and the average grain shape factor was 0.74.Compared with ZL105 alloy without Ce,the grain size(115.37 μm)of the α-Al phase decreased by 42.99％,and the average grain shape factor increased by 76.19％(0.42).Compared with ZL105 alloy without cerium,the hardness of ZL105 alloy with 0.6％cerium increased by 31.64％.The addition of rare earth cerium also greatly improved the corrosion resistance of the alloy.When the content of cerium was 0.6％,the corrosion rate of the alloy was 10.85 mg·cm-2·d-1,which was 50.93％lower than that of the alloy without rare earth cerium.The corrosion potential of the alloy was increased and the corrosion current density was decreased.According to the observation of the corrosion surface morphology,the corrosion pits and cracks of the alloy added with rare earth cerium were obviously reduced,and the corrosion surface gradually became flat and smooth,and the corrosion morphology was greatly improved.
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